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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'd8cd919ede0f2e5c63c9ca64a1c656083bf48436166344c3e6a81fad658c034d' 
  AND token = '6c5vr49zDxqKjQ5aOM7YLoen7+HsZLISfrSN7oGiQVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}